ExperimentalUnique identifier for the newly created forked session.
OptionalmodesInitial mode state if supported by the Agent
See protocol docs: Session Modes
OptionalconfigInitial session configuration options if supported by the Agent.
Optional_The _meta property is reserved by ACP to allow clients and agents to attach additional metadata to their interactions. Implementations MUST NOT make assumptions about values at these keys.
See protocol docs: Extensibility
UNSTABLE
This capability is not part of the spec yet, and may be removed or changed at any point.
Response from forking an existing session.